Investigation of the impact of locomotive creep control on wear under changing contact conditions

Abstract

This paper presents the locomotive traction controller performance with respect to the track wear under different operation conditions. In particular, an investigation into the dynamic response of a locomotive under changing wheel-rail friction conditions is performed with an aim to determine the effect of controller setting on track wear. Simulation using a full-scale longitudinal-vertical locomotive dynamic model shows that the appropriately designed creep threshold, controller, settings can effectively maintain a high tractive effort while avoiding excessive rail damage due to wear, especially during acceleration under low speed.

Parallel co-simulation of locomotive wheel wear and rolling contact fatigue in a heavy haul train operational environment

“…The influences of train dynamics on locomotive wheel wear and RCF are also reflected by the interaction between train dynamics and traction control systems. 17–19 It is easy to understand that, under different in-train forces, different traction control commands are needed.…”

Online Estimation of the Adhesion Coefficient and Its Derivative Based on the Cascading SMC Observer

“…Adhesive control algorithms can be divided into two types according to the maximum adhesion point tracking: readhesion control and optimized adhesion control [5].…”

Modelling of track wear damage due to changes in friction conditions: A comparison between AC and DC electric drive locomotives

“…Locomotive dynamic modelling A 2-dimensional locomotive diagram is as shown in Fig.1b, including longitudinal, vertical and pitch modes of locomotive operation, and is detailed in [8]. This model has 21 degrees of freedom (DOF), including 9 DOF on the longitudinal, vertical and pitch motions of locomotive body and its two bogies, and 12 DOF on vertical and rotating motions of six wheelsets.…”

“…In general, locomotives with new AC traction motors are operated with much higher continuous traction forces and adhesion levels compared to locomotives with DC motors. Recently, it was shown that the rail/wheel contact mechanics and the dynamic response caused by a change in contact conditions of the new AC driven locomotives is significantly different to the DC models [8]. Thus it is necessary to investigate and compare the effect of the AC and DC drives dynamics on the wear growth independently by establishing detailed electric dynamic models with AC and DC drive models.…”

“…Combining with contact mechanics model [11], and complex electric dynamics model [8] to investigate the effect of wheel-rail contact surface [6], and electric dynamics, the model is capable to simulate many features such as wear behaviour of a locomotive in real operation conditions. It has been concluded that the transient dynamics can induce excessive traction and normal force oscillation, therefore cause extra wear for a short period of time after a change in friction conditions [12].…”